考虑热效应的涡轮增压器浮环轴承动态特性研究

摘要

On the basis of fluid lubrication,considering the effect of thermal effect on the oil film viscosity,the dynamic characteristics of the floating ring bearing of turbocharger were studied.Parameterized model of turboeharger floating ring bearing was established by the software DyRoBes-Beperf,and the oil film pressure distribution,the variation of eccentricity,oil film stiffness and damping with speed were analyzed when the ring ratio is constant.The results show that when the floating ring bearing structure parameters and the load are certain,with the increasing of rotor speed,the eccentricity is decreased and the Sommerfeld number and power consumption are increased,while the Sommerfeld number and power consumption of the inner oil film are greater than that of the outer oil film,therefore,the bearing capacity of inner oil film is bigger than that of outside oil film.As the eccentricity is decreased with the increasing of rotating speed,the equivalent stiffness and equivalent damping of the oil film are decreased.%以流体润滑为基础,考虑热效应对油膜黏度的影响,研究涡轮增压器浮环轴承的动态特性,利用DyRoBes-Beperf软件建立涡轮增压器浮环轴承的参数化模型,在环速比一定时分析浮环轴承内外油膜压力的分布,以及偏心率、油膜的刚度、阻尼随转速的变化规律.研究表明:在浮环轴承结构参数及载荷一定的情况下,随转子转速的增加,其偏心率下降,Sommerfeld数和功耗均增大,且内油膜的Sommerfeld数、功耗大于外油膜的Sommerfeld数及功耗,因此内油膜承载力大于外油膜承载力;因偏心率随转速的增大而减小,因此油膜等效刚度和等效阻尼下降.